package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.enume.OrderStatusEnum;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.service.WareSkuService;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.Data;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {
    @Autowired
    private ProductFeignService productFeignService;
    @Autowired
    private RabbitTemplate rabbitTemplate;
    @Autowired
    private WareOrderTaskService orderTaskService;
    @Autowired
    private WareOrderTaskDetailService orderTaskDetailService;
    @Autowired
    private OrderFeignService orderFeignService;

    /**
     * 库存解锁
     * update `wms_ware_sku` set stock_locked=stock_locked-2
     * where sku_id=8 and ware_id=1
     */
    private void unLockStock(Long skuId, Long wareId, Integer skuNum, Long detailId) {
        //库存解锁
        baseMapper.unLockStock(skuId, wareId, skuNum);
        //更新库存工作单详情状态
        WareOrderTaskDetailEntity orderTaskDetailEntity = new WareOrderTaskDetailEntity();
        orderTaskDetailEntity.setId(detailId);
        orderTaskDetailEntity.setLockStatus(2); //2已解锁
        orderTaskDetailService.updateById(orderTaskDetailEntity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * 查询条件
         * skuId: 1
         * wareId: 1
         */
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        WareSkuDao baseMapper = this.baseMapper;
        //1、如果还没有这个库存记录就是新增操作
        List<WareSkuEntity> entities = baseMapper.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setWareId(wareId);
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setStockLocked(0);
            //远程查询sku名字  ,两种方法 ：如果失败，整个事物无需回滚
            //    1、自己catch掉异常
            //    2、TODO: 2022/6/11 还可以有什么办法可以让异常出现不回滚事物
            try {
                R info = productFeignService.info(skuId);
                if (info.getCode() == 0) {
                    Map<String, Object> skuInfo = (Map<String, Object>) info.get("skuInfo");
                    skuEntity.setSkuName((String) skuInfo.get("skuName"));
                }
            } catch (Exception e) {
                //  把这里去掉，不让他抛异常
            }

            baseMapper.insert(skuEntity);
        } else {
            //2、如果有的话就是更新的操作
            baseMapper.addStock(skuId, wareId, skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            //select SUM(stock-stock_locked) from  `wms_ware_sku` where sku_id=8
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     *
     * @return 默认是运行时异常都会回滚，可不加
     * @Transactional(rollbackFor = NoStockException.class)
     * 库存解锁场景
     * 1）、下订单成功，订单过期没有支付被系统自动取消、被用户手动取消，解锁库存
     * 2）、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚，之前锁定的库存就要自动解锁
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        taskEntity.setCreateTime(new Date());
        orderTaskService.save(taskEntity);


        //1、按照下单地址，找到一个就近仓库，锁定库存
        //1、找到每个商品在哪个仓库都有库存
        List<SkuWareHashStock> collect = vo.getLocks().stream().map(item -> {
            SkuWareHashStock stock = new SkuWareHashStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = baseMapper.listWareIdHashSkuStock(skuId);
            stock.setWareId(wareIds);

            return stock;
        }).collect(Collectors.toList());


        //2、锁定库存
        for (SkuWareHashStock hashStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hashStock.getSkuId();
            List<Long> wareIds = hashStock.getWareId();
            if (wareIds == null && wareIds.size() == 0) {
                //没有任何仓库有这个商品
                throw new NoStockException(skuId);
            }
            //1、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            //2、锁定失败，前面保存的工作单信息就回滚了，发送出去的消息，即要解锁的记录由于数据库查询不到id,所以不用解锁
            for (Long wareId : wareIds) {
                //  成功返回1，否则返回0
                /**
                 * update	`wms_ware_sku` set stock_locked=stock_locked+1
                 * where sku_id=8 and ware_id=2 and stock-stock_locked>=1;
                 */
                Long count = baseMapper.lockSkuStock(skuId, wareId, hashStock.getNum());
                if (count == 1) {
                    skuStocked = true;
                    // TODO: 2022/8/8  告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "",
                            hashStock.getNum(), taskEntity.getId(), wareId, 1);//1 锁定
                    orderTaskDetailService.save(entity);
                    //rabbitTemplate 发送锁定库存消息，方便后面解锁
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, stockDetailTo);
                    //只是发id不行，防止回滚以后找不到数据
                    lockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    //执行成功，跳出循环
                    break;
                } else {
                    //当前仓库锁定失败，重试下一个仓库
                }
            }
            if (skuStocked == false) {
                //    当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }
        //3、肯定全部都是锁定成功的
        return true;
    }


    /**
     * 1、库存自动解锁
     * 下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚，之前锁定的库存就要自动解锁
     * 2、订单失败
     * 锁库存失败
     * 只要解锁库存消息失败，一定要告诉服务解锁失败
     * 方法已经搬迁到listener中
     */
    @Override
    public void unlockStock(StockLockedTo to) {
        //得到库存工作单的id wms_ware_order_task
        StockDetailTo detail = to.getDetail();
        Long detailId = detail.getId();
        // 解锁
        //1、查询数据库关于这个订单的锁定库存信息
        //     有：证明库存锁定成功了
        //            解锁：订单情况
        //                  1、没有这个订单，必须解锁你
        //                  2、有这个订单，不是解锁库存
        //                        看订单状态：   已取消，解锁库存
        //                                      没有取消，不能解锁库存

        //      没有：库存锁定失败了，库存回滚了，这种情况无需解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            //查询工作单 wms_ware_order_task
            WareOrderTaskEntity orderTaskEntity = orderTaskService.getById(to.getId());
            String orderSn = orderTaskEntity.getOrderSn();
            //根据订单号  查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                // 订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == OrderStatusEnum.CANCLED.getCode().intValue()) {
                    /**
                     * 1、订单不存在 订单回退了
                     * 2、订单被取消,才能解锁库存
                     */
                    if (byId.getLockStatus() == 1) {
                        //当前库存工作单详情  已锁定，但是未解锁，才能解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }

                }
            } else {
                //调用失败，消息重新入队
                //消息拒绝以后重新放到队列里面，让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }
            //解锁
        } else {
            //库存工作单，和库存工作单详情都回滚了
            //  无需解锁
        }

    }

    /**
     * 防止订单服务卡顿，导致订单状态一直改不了，库存消息优先到期，查询订单状态是新建状态，什么都不做就走了
     * //导致卡顿的订单永远得不到解锁库存
     *
     * @param orderTo
     */
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查询一下最新的库存解锁状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        //   按照工作单找到工作单详情中没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", task.getId())
                .eq("lock_status", 1));
        //(Long skuId, Long wareId, Integer skuNum, Long detailId
        if (entities != null && entities.size() > 0) {
            for (WareOrderTaskDetailEntity entity : entities) {
                unLockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
            }
        }

    }


    /**
     * 1、内部类
     */
    @Data
    class SkuWareHashStock {
        private Long skuId;
        private List<Long> wareId;
        private Integer num;

    }

}